Question

a car travels at a speed of 80 km per hour during the first half of its running​

Answer 1

Answer:

For first half, distance=v1t/2.........for second half, distance=v2t/2

Average speed=v1t/2+v2t/2 the whole divided by t/2+t/2

                    =v1t+v2t/2/t

                    =v1+v2/2

 

                      80+40/2 = 60 km/h

Explanation:

Answer 2

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